M33 Bolts | McMaster-Carr

Made of alloy steel, these screws are the standard for high-strength fastening. Use them in high-load applications such as dies, presses, and heavy equipment. The deep, six-point socket keeps the hex key from slipping out and damaging the drive.

Length is measured from under the head.

Black-Oxide Alloy Steel—Typically chosen for their appearance, these screws have a dark, matte coating to create a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

		Head, mm
	Lg., mm	Dia.	Ht.	Threading	Thread Spacing	Tensile Strength, psi	Fastener Strength Grade/Class	Specs. Met	Pkg. Qty.		Pkg.
Black-Oxide Alloy Steel







				M33 × 3.5 mm

				100	50	33	Fully Threaded	Coarse	170,000	Class 12.9	DIN 912, ISO 4762	1	91290A283	000000


				120	50	33	Partially Threaded	Coarse	170,000	Class 12.9	DIN 912, ISO 4762	1	91290A284	00000

Threaded Rods

Anchor, connect, or hang components in a wide variety of applications, from mounting I-beams to suspending light fixtures.

Medium-Strength Steel

Image of Product. Front orientation. Threaded Rods. Threaded Rods.

With tensile strengths from 110,000 psi to 125,000 psi, these rods are strong enough for most industrial applications, such as anchoring machinery and connecting pipe flanges. They are about twice as strong as low-strength steel rods. To avoid stripped threads during installation, make sure your nuts are also medium-strength steel.

Zinc-Plated Steel—The most common choice for areas with occasional exposure to moisture.

Steel—Best for dry environments since moisture will cause these rods to rust.

	Hardness	Specs. Met		Each
Zinc-Plated Steel







	M33 × 3.5 mm

	1 m	110,000	Class 8.8	Rockwell C20	DIN 976	99067A141	0000000


	Steel







					M33 × 3.5 mm

					300 mm	125,000	ASTM Grade B7	Rockwell C35	ASTM A193, DIN 976	93325A453	000000


					300 mm	110,000	Class 8.8	Rockwell C20	DIN 976	99055A339	00000
					1 m	125,000	ASTM Grade B7	Rockwell C35	ASTM A193, DIN 976	93325A454	000000
					1 m	110,000	Class 8.8	Rockwell C20	DIN 976	99055A341	000000
					2 m	125,000	ASTM Grade B7	Rockwell C35	ASTM A193, DIN 976	93325A455	000000

High-Strength Steel

With a tensile strength of 150,000 psi, these rods are strong enough to stabilize steel frameworks and structural supports, such as I-beams. They are about 25% stronger than medium-strength steel rods. To avoid stripped threads during installation, make sure your nuts are also high-strength steel.

Steel—Best for dry environments since moisture will cause these rods to rust.

	Hardness	Specs. Met		Each
Steel







	M33 × 3.5 mm

	1	150,000	Class 10.9	Rockwell C32	DIN 976	1078N99	0000000

Low-Strength Steel

With a tensile strength of 50,000 psi or 60,000 psi, these rods are often used to suspend light fixtures, cable trays, and conduit from ceilings. They're about half the strength of medium-strength steel rods. To avoid stripped threads during installation, make sure your nuts are also low-strength steel.

Zinc-Plated Steel—The most common choice for areas with occasional exposure to moisture.

Steel—Best for dry environments since moisture will cause these rods to rust.

	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel







	M33 × 3.5 mm

	300 mm	50,000	Rockwell B49	DIN 976	1	94595A251	0000000


	1 m	50,000	Rockwell B49	DIN 976	1	94595A252	000000


	Steel







					M33 × 3.5 mm

					300 mm	50,000	Rockwell B49	DIN 976	1	98861A235	00000


					1 m	50,000	Rockwell B49	DIN 976	1	98861A175	00000

Stainless Steel

More corrosion resistant than steel rods and comparable in strength to low-strength steel.

18-8 Stainless Steel—The choice for wet and outdoor environments, these rods resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel







	M33 × 3.5 mm

	1	70,000	Not Rated	DIN 976	1	90024A318	0000000

Stainless Steel Hex-Drive Shoulder Screws

These screws hold up against moisture and chemicals better than their steel counterparts, but they aren't as strong.

Check out our Made-to-Order Stainless Steel Hex-Drive Shoulder Screws if you don't see the shoulder length you need.

Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel—Combines a finished appearance with the rust resistance of 316 stainless steel. Even if the coating wears off, these screws will hold up against corrosive agents in most environments, including salt water and most chemicals.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

				Head, mm							Each
	Shoulder Lg., mm	Thread Size	Thread Lg., mm	Dia.	Ht.	Drive Size, mm	Tensile Strength, psi	Specs. Met	Material Certificate Form		1-4	5-Up
Highly Corrosion-Resistant Black-Oxide 316 Stainless Steel







				36 mm Diameter Shoulder (-0.072 mm to -0.01 mm Tolerance)

				50	M33 × 3.5 mm	40	54	22	17	70,000	ISO 7379	Digital	90269A946	000000	000000


				60	M33 × 3.5 mm	40	54	22	17	70,000	ISO 7379	Digital	90269A947	00000	00000
				70	M33 × 3.5 mm	40	54	22	17	70,000	ISO 7379	Digital	90269A949	00000	00000
				80	M33 × 3.5 mm	40	54	22	17	70,000	ISO 7379	Digital	90269A951	00000	00000
				90	M33 × 3.5 mm	40	54	22	17	70,000	ISO 7379	Digital	90269A953	00000	00000
				100	M33 × 3.5 mm	40	54	22	17	70,000	ISO 7379	Digital	90269A954	00000	00000
				120	M33 × 3.5 mm	40	54	22	17	70,000	ISO 7379	Digital	90269A955	00000	00000
				130	M33 × 3.5 mm	40	54	22	17	70,000	ISO 7379	Digital	90269A956	000000	000000
				140	M33 × 3.5 mm	40	54	22	17	70,000	ISO 7379	Digital	90269A957	000000	000000
				150	M33 × 3.5 mm	40	54	22	17	70,000	ISO 7379	Digital	90269A958	000000	000000